#include <stdio.h>

#include <jni.h>





JNIEnv* create_vm() {

       JavaVM* jvm;

       JNIEnv* env;

       JavaVMInitArgs args;

       JavaVMOption options[1];

   int res;





/* There is a new JNI_VERSION_1_4, but it doesn't add anything for the purposes of our example. */

args.version = JNI_VERSION_1_2;

args.nOptions = 1;

options[0].optionString = "-Djava.class.path=c:\\cygwin\\tmp\\javatest";

args.options = options;

args.ignoreUnrecognized = JNI_TRUE;



   fprintf (stderr, "about to call CreateJavaVM.\n");

       res = JNI_CreateJavaVM(&jvm, (void **)&env, &args);

   fprintf (stderr, "CreateJavaVM returned [%d].\n", res);

       return env;

}





void invoke_class(JNIEnv* env) {

       jclass helloWorldClass;

       jmethodID mainMethod;

       jobjectArray applicationArgs;

       jstring applicationArg0;





   fprintf (stderr, "step 2...\n");

       helloWorldClass = (*env)->FindClass(env, "HelloWorld");



   fprintf (stderr, "    class = %p\n", helloWorldClass);





fprintf (stderr, "step 3...\n");

mainMethod = (*env)->GetStaticMethodID(env, helloWorldClass, "main", "([Ljava/lang/String;)V");

   fprintf (stderr, "    method = %p\n", mainMethod);



fprintf (stderr, "step 4...\n");

applicationArgs = (*env)->NewObjectArray(env, 1, (*env)->FindClass(env, "java/lang/String"), NULL);

applicationArg0 = (*env)->NewStringUTF(env, "From-C-program");

// (*env)->SetObjectArrayElement(env, applicationArgs, 0, applicationArg0);



fprintf (stderr, "step 5...\n");

(*env)->CallStaticVoidMethod(env, helloWorldClass, mainMethod, applicationArgs);

}



int main(int argc, char **argv) {

       JNIEnv* env = create_vm();

   fprintf (stderr, "step 1 done...\n");

       invoke_class( env );

   return 0;

}